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CAIE IGCSE Biology 11.1.6 Internal & External Intercostal Muscles

Practise identifying internal and external intercostal muscles in diagrams of ribs and the thorax.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • identify intercostal muscles as the muscles positioned between adjacent ribs
  • label an external intercostal muscle from its fibre position in a thorax diagram
  • distinguish internal and external intercostal layers when both are shown in cross-section

11.1.6—Internal and external intercostal question 1

[Maximum number: 1]

Fig. 1.1 is a diagram of the gas exchange system in humans.

Fig. 1.1

Fig. 1.1

Draw a label line and the letter X on Fig. 1.1 to identify an external intercostal muscle.

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